[u-u] Published list address not working?

[Dan Astoorian]

I tried replying to Giles Orr's message at the published list address 
(u-u at mail-ml.infra-service.ca)... my messages keep bouncing.

I've attached the non-delivery notice.  Am I doing something wrong?

-- 
Dan Astoorian, Systems Administrator
Engineering Computing Facility
University of Toronto
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